Help! I have read several recommendations for boosting octane of the (crappy) gas on the market these days. The owners manual of my '85 KTM says "DO NOT USE OCTANE BOOSTERS OR GASOLINE CONTAINING ETHANOL OR METHANOL" or your connecting rod will break, your stock portfolio will go in the toilet, etc. So, why then is it okay to put octane booster in my '71 Six-Day (which I just finished rebuilding), and what about gas with ethanol? What is a good (safe) octane rating to use in the Six-Day (with/without booster)? And how about the plug gap (NGK B8HS)? (Yes, I put the thing back together without a manual.)
Many thanks!
Many thanks!